I used this:Silicone Remover quite successfully the other day on my van.
A strip of sealant had been run across the top of the windows that was too much to scrape off. Just use a gun to squeeze over the top and leave for a couple of hours or so when pretty much just wipe off.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets