Yes. I clean or belt once a month. I like you, took over the print room where the Previous guys never cleaned it.
I used Methanol...it works way better and faster. But because it wasn't an "approved" solution we stick to alcohol unless we have a huge buildup that won't come off. Methanol didn't do anything bad to our belt.... But we've only done it three times with methanol, the rest is alcohol.
We usually spray the front end and service end with ipa... Throw some packing foam ontop.... Wait an hour, come back and scrape it... Wipe.tje belt,off good because you'll have tons of flakes that like to stick to substrates... Advance it a foot and repeat until the whole thing is clean.
Do a small test and see if it works for you. Hard to say without seeing the belt, but it should... You might just need a longer time.
You can buy plastic scrapers as well... Don't use a metal one though.. If you cut your belt, it's an expensive fix.