Rubbing alcohol (Castle MK40)

Does anyone have any rubbing alcohol (also called Isopropanol) lurking in a shed or garage, please? According to Google, it can be helpful in cleaning slate tiles, but as it might or might not work, I'm not keen to buy a whole litre of it, only to find that it doesn't work and it sits in my loft with all the other stuff that doesn't work..... I only have a few small splashes to try to clean, so if anyone does have a little bit left over, please, I would be very grateful to give it a go.

Many thanks,
Heather