Removing Tar Spots on the cheap

Our caravan had an array of little black spots I realised must be tar on its "nose cone" from driving through roadworks, so I hunted on the C&MC forum for answers, and found there none - there was someone asking what to use a while back, but no replies to him.

C'van Talk forum threads offered loads of suggestions, from branded products to acetone. I checked acetone & fibreglass on the wider web & came up with a boat builder who uses it to clean his hulls, so I decided it must be OK. It works like a dream! No need for shiny labelled pots of special stuff at all
A quick wipe & it vanishes, and while the boat builder reckoned to be followed by a cloth wielding partner, I followed it with a clean wipe & a good rinse with a wet sponge, so as not to leave it on the surface - though it probably evaporates anyway.

So it's a bit like using vinegar in the laundry - not what the adverts say, but a lot cheaper and perfectly effective!

Other recommendations were for brake fluid, WD40, petrol - which came with warnings - white spirits, as well as the Products.

I'm still wondering what to use on the paintwork.