well. it has been a couple months since we stained our deck, and while doing it, some sprayed on the siding. i have tried soap and water, paint thinner and a steel wool. nothing has really made a dent on it.

what can i do besides

 

What about one of those magic erasers? Rubbing alcohol? C4?

 

Maybe one of the citrus cleaners? Doing a quick Google search tells me your only remedy might be replacing the siding.

 

trying to use c4 as a last resort, but i will try those

 

damn

 

Unfortunately, I think you will have to replace it. Deck stain is meant to penetrate the surface it goes on and adhere very well. The only thing I can think off that may stand a chance at cleaning it off is something like MEK or Acetone which will also destroy the siding.