It is general discussion after all.......

So, I have a house that some twa@! has painted without using drop sheets on what is most likely a Tassie Oak floor. I've tried metho, detergent and water and turps without success. I have on my list to try, acetone, rubbing alcohol and oxcylic acid (although my understanding is that it will bleach the floorboards). Does anyone have any experience of this and if so what did you do/use to remedy it. If I absolutely have to I will sand but the boards are in such good condition it would be a shame to sand unless no other option. Also has anyone sanded their own floors with a hire drum sander, edger etc. Did it go well is there any advice/tips you can offer?
Any advice/information appreciated.
Meg.