Hazmat Stickers

I carry a small propane torch. Heat them up a little and have at them with the putty knife and they come right off

 

Bug spray, like "Off!" If you spray it and let it soak for a minute or two, it eats right through the glue but won't damage the paint, should scrape off easily after that.

 

Harbor Freight, Tool Zone, Home Depot, Lowe's get a sharp scraper. The one's we carry have the handle of a hammer, the blade if about 3" long, looks like a razor blade.

QEP 4 in. Wide Razor Scraper and Stripper-62900Q - The Home Depot

 

acetone and a rag....AKA Nail Polish Remover.

 

Perhaps a orange spray used for cleaning. Light acid might do the trick. (Citrus acid from oranges...) Wet it down and then scrape.

In my day we used a battleship grey spray can PFFTH done. Slap another on top when necessary.

 

Use a plastic scraper to reduce the chances of cutting through paint. Bug spray is a good idea as mentioned. Acetone can be very harsh on paint as well it will eat fibreglass so using acetone you cannot leave it on too long.

 

works so quick it won't be on too long...

 

Warner 4 in. Long Handle Wall Scraper-2814 - The Home Depot