I have had several customers in the last 2 weeks call me for help with biting mites or black pepper mites. These mites are too small to see and leave behind bites that appear like pimples.
One customer reported that they had tremendous success when using a combination of Kleen Free and HiYield Sulphur Powder. She would clean with the Kleen Free and let it dry, then spread the sulphur powder on the floors for 30 minutes, vacuum the dust up and then use Kleen Free to clean up any of the residue.
Let me know if this helps you also.