Try soft soap.....tho` may not be called same in US basically a natural runny soap solution. Vinyl seat...is it a classic car Websites for classics may help
Finally found the items required to clean crayons from vinyl or leather.
USE OXI-CLEAN WITH A SMALL AMOUNT OF DISHWASHER DETERRGENT
ON THE CRAYON. LET SET FOR 10 MINUTES THEN WITH A WET CLOTH
WIPE OFF.
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