I've just picked up another scoob which has black cloth seats which are a bit grubby.
I usually use Decosol foam cleaner but was wondering if there was anything else worth considering?
I don't want to wash them as it'll take too long to dry so looking for some sort of foam cleaner

cheers

Meguiars All Purpose Cleaner is good for such jobs, but doesn't foam very much (even when used with a foaming spray head), so you need to go easy with it to avoid too much wetting (if you don't plan to extract afterwards). If you have a method that works well for you I'd stick with it, particularly if you find it avoids too much wetting, which is always where most folk go wrong with fabric cleaning. :)