Help!!! I have had these really small brownish colored bugs on my window seals, wall, and floor for about 3 weeks now. Here are the details:

- brownish in color that you can easily wipe up (leave a small brown streak that doesn't stain)

- Pest control has been out 4-5 times in past 3 weeks to spray (heavily) indoors and out. Doesn't seem to be slowing things down.

- Pest control said it is some type of mite (clover/spider/etc) but can't tell for sure without looking under microscope but, at any rate, not harmful just nuisance

- Pest control said it could take weeks to get under control and there is a lot of substance slowing them down and they will eventually die. They have sprayed barrier of house, grass, rock area, etc. but still don't see much improvement

- I vacuum up daily and they are back within matter of mins/hours

- Primarily on windows on sunny side of house and more abundant when sun is shining on windows

- If you don't look closely you would mistake for speck of dirt. They are very small

Are these MITES? Or, something else? Does it take this long to get rid of them?