Do you think this will work?

[desertlzbn]

I have had a huge problem with mealy bugs, spider mites, and other assorted bugs.
I have a greenhouse that I only have a roof on at this point, so it is just the wooden standing structure, that has a paver floor right now, I have cleaned out all plants and containers in there, and need to know if starting over fresh would help with the mealy bug problem.

Would getting a BIG bottle of Malathion and spray the whole greenhouse down, solve my mealy bug problem?

I plan on emptying the whole thing out, bleaching every surface, then spraying every surface down with the bad bug killer stuff.
I think the mealy bugs were in my dirt, cause they sure did come back after this winter.
I hope they are not able to survive.
But should I do this, is the risk of using the bug killer junk worth it?
Is it that toxic to humans if you don't use it on SOIL or PLANTS?

I do plan on wearing long sleeves and pants and a mask when using the spray.