So I had the super nice gfx mod, forget the specific one.
Rather than trying to use ASI manager (which I can't find on my PC anymore) I backed up the GTAV folder from steam onto another drive, deleted it and am currently re-downloading it again.
Question: Is that enough? or do the mods leave other things I should remove in other places? https://gbp.cnv.to/usd/17.99