Oh I am glad you mentioned about the breathing. I was going to buy some but have asthma, and cleaning stuff sets me off. Thank you!!!Vikaal is good but i find it really affects my breathing. You could try soaking cotton wool in white vinegar and leaving it on the mark for a while. I did this and put cling film over the top of the cotton wool to keep it moist. Or raw lemon half rubbed on is also good.