How to remove silicone from windscreen





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  1. #1
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    Default How to remove silicone from windscreen

    Evening all
    I have been struggling with mounting my Garmin DriveAssist in my vehicle- the suction cup for the windscreen really has not been up to the task when we have been offroad. So I tried using silicone sealant, as recommended in some threads here on the Forum... epic fail basically as it all fell off on our latest trip, and Iím now trying dash mounts and will probably try a RAM mount. But meanwhile, I have a really annoying disc of old silicone adhesive in mid-windscreen. Tried peeling it off, careful scraping with a sharp blade, nail polish remover... no luck. Can anyone tell me of a magic product or method to get rid of the silicone?
    Thanks in advance!

  2. #2
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    Default Re: How to remove silicone from windscreen

    Maybe apply heat? Heat gun or hairdryer to soften it.

  3. #3
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    Default Re: How to remove silicone from windscreen

    Bostik and others make a silicon remover.
    Freely available at hardware stores.
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  4. #4
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    Default Re: How to remove silicone from windscreen

    A razor blade. Or a Stanley blade. Last little bit with your thumb. Silicone is extremely stable and doesn't react to anything. But, if it is a cheap one, like Home, or Bath or the likes, it will react to a solvent like thinners, petrol, acetone.

    Just be careful. There is a film inside your windscreen. When you scratch, keep that blade extremely shallow. Try to not make it dig deeper than the silicone.
    Last edited by Henris; 2019/05/08 at 07:42 PM.
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  5. #5
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    Default Re: How to remove silicone from windscreen

    I will get me to a Builders as soon as possible- thank you!

  6. #6
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    Default Re: How to remove silicone from windscreen

    Quote Originally Posted by Roberto Betta View Post
    Maybe apply heat? Heat gun or hairdryer to soften it.
    I would be careful with heat. If concentrated it might lead to cracking.
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  7. #7
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    Default Re: How to remove silicone from windscreen

    Quote Originally Posted by jfh View Post
    I would be careful with heat. If concentrated it might lead to cracking.
    Silicone is fairly stable at increased temperatures, so heat is not effective.

    Silicone remover is the best bet, otherwise acetone and a blade.

  8. #8
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    Default Re: How to remove silicone from windscreen

    Yes I understand. I was referring to the glass.
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  9. #9
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    Default Re: How to remove silicone from windscreen

    Quote Originally Posted by jfh View Post
    Yes I understand. I was referring to the glass.
    I am agreeing with you, but also indicating that it would be.a waste of time.

  10. #10
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    Default Re: How to remove silicone from windscreen

    petrol will affect most silicone sealers. If that fails pop past you local goldwagen and get this

    https://www.liqui-moly.com.au/produc...spray-aerosol/
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  11. #11
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    Default Re: How to remove silicone from windscreen

    A heat gun is going to do zip to it. Silicone is bitch to get off. Evwn that silicon remover only works on very cheap ones. Wd40 or acetone also helps a bit. Its not an adhesive that glues things together it fails dismally as a glue as far as I am concerns and makes a mess that takes hours to het off. Dont know why it keeps being recommended to stick things together. Ita meant to seal around glass and showers etc. You will have more luck sticking that holder to your windscreen with bostic contact and it will be easier to remove when you want to take it off as acetone dissolves it.
    Last edited by Fishing1; 2019/05/08 at 08:11 PM.

  12. #12
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    Default Re: How to remove silicone from windscreen

    Quote Originally Posted by Fishing1 View Post
    A heat gun is going to do zip to it. Silicone is bitch to get off. Evwn that silicon remover only works on very cheap ones. Wd40 or acetone also helps a bit. Its not an adhesive that glues things together it fails dismally as a glue as far as I am concerns and makes a mess that takes hours to het off. Dont know why it keeps being recommended to stick things together. Ita meant to seal around glass and showers etc. You will have more luck sticking that holder to your windscreen with bostic contact and it will be easier to remove when you want to take it off as acetone dissolves it.
    Was the recommendation for better adhesion not silicone spray on the suction cup rather than silicone sealer? Agreed on the utility knife suggestion with shallow angle, at least to get most of it off.


  13. #13
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    Default Re: How to remove silicone from windscreen

    Thanks for all the input. I have scraped quite a bit off with a sharp utility blade, without scratching the glass so far. So the bulk is off. I will try some petrol tomorrow, then off to find silicone remover if still have a problem.

  14. #14
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    Default Re: How to remove silicone from windscreen

    Quote Originally Posted by Stephan van Tonder View Post
    petrol will affect most silicone sealers. If that fails pop past you local goldwagen and get this

    https://www.liqui-moly.com.au/produc...spray-aerosol/
    this, petrol work by far the best it makes the silicone go gummy and easy to remove.

    edited to add, you may need a couple of applications. wipe the silicone with a petrol soaked rag, give it a couple of minutes and then scrape off the silicone that has gone soft. Repeat as often as is required to get through all the layers.
    Last edited by mullerza; 2019/05/08 at 08:48 PM.
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  15. #15
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    Default Re: How to remove silicone from windscreen

    Definitely going to try petrol next time thanks

  16. #16
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    Default Re: How to remove silicone from windscreen

    Just be carefull wirh petrol and thinners and stuff....if it gets on your dash there might be a problem. I would use benzine, harmless to your dash but will soften the last layer silicone to scrape of with your nail. Then windolene to clean your windscreen .

  17. #17
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    Default Re: How to remove silicone from windscreen

    3M make a very thin double sided tape, when peeled it's almost like a jelly, sticks like you can't believe. My Garmin is stuck onto dash with a pop socket (so surface area just bigger than a R5) and hasn't budged for months.

  18. #18
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    Default Re: How to remove silicone from windscreen

    Quote Originally Posted by sparewheel View Post
    3M make a very thin double sided tape, when peeled it's almost like a jelly, sticks like you can't believe. My Garmin is stuck onto dash with a pop socket (so surface area just bigger than a R5) and hasn't budged for months.
    It is Removable Gel Tape.

    When it gets dirty, wash with water and it is good as new.
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  19. #19
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    Default Re: How to remove silicone from windscreen

    Agood old razor blade is the best. Stanley blade is good, just watch the edges and scratching. the round blade of a leathermans works, just need to scrape more. (can't scratch the glass). (remember the windscreen is curved so scrap carefully.)

    followed up with a damp cloth with meths, just to finish it off..

    chemicals will do damage and heat will not work and will do damage. Watch the dash and ceiling.
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  20. #20
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    Default Re: How to remove silicone from windscreen

    Never liked those suction cups. My Garmin is attached to a friction mount which I can move anywhere on the dash. Good even on corrugated roads.

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