Or maybe a hair dryer will work. Use one that has a really good hot setting and point it at the edge of the transfer to heat up both the transfer and the glue beneath so that both can be removed as you peel off the vinyl. The transfer may get quite hot and you may take off the transfer but leave some glue but Tar and Bug removers (from your local motor parts shop) or glue removers made by 3M could assist. If you use any of these brands try it on some part of the van where it won't matter just to see if it damages the body. Then wash and wax and have a brew.
Phil When you feel like placing a new vinyl decal on your car, then visit us
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If you go and ask one of your local sign makers they will tell you the best way to remove and clean the glue off and more than likely let you have the stuff to do it (if you're really lucky they may even offer to do it for you).
I certainly would not use heat as this tends to harden the glue and could possibly damage the surface to which the sticker is on (paint or plastic)
I had some stickers removed from my lorry the other day. The guy used a heat gun to remove the sticker then tar & glue remover to remove the glue & gunge from the paintwork prior to applying my new stickers.
I thought the surface was clean until he sprayed this stuff on it, he let it work for a minute or so then wiped it off & the surface was as good as when the vehicle was delivered new.
Asking a valeter or a visit to your local commercial vehicle paint shop would probably get information on which named product to buy in your area.
Use good old "white spirit", cheap and cheerfull.
I have worked with this for over thirty years. We use it to remove old paper and vinyl labels. Beleiv it or not it is an oily solvent with a high flash point (>30)E.G not an agressive solvent. apply it with a soft cloth leave it for a few minutes to soften the glue, then wipe with another damp white spirit laden cloth. finally buff with a dry cloth and apply a good polish afterward.
Solvents with a low flashpoint are more agressive and will remove paint.
I use car tar spot remover and it takes off sticky stuff a treat without damaging the paint work. I have even used it on the windows after trying it on the edge first to make sure it didn't mark it.
I am quite aware that the health and safety bods will jump in, but a quick wipe over with a rag dipped in a spot of petrol will take the adhesive straight off,
------------- Regards
Terry Birch
Our tourer days are over and we have moved on to a Hobby Motorhome