Revisiting this topic. I suspect that I have dust mites on my sofa cos I occasionally get bitten. Can't see the damn insect but I can feel the bite which looks like mossie bite but it leaves a scar. Tried to look for the dust mites using magnifier but I dont see anything creeping around the sofa.  I don't think it is bed bugs as I don't get bitten on my bed plus I believe beg bugs are visible to the eyes..so far I see nothing.

Anyone knows what type of spray I can use? I couldn't find isopropyl alcohol so I got the methylated alcohol instead which has 90% alcohol.  It didn't seem to work.

I don't want to buy a steamer just for this purpose.  Any other solution?