On a whim I thought I'd try to comb my little rug carpets using my pet brushes. One is the "Furminator" pet brush and another just a cheap little wire pet comb/brush. Both worked great!
I placed the rugs outside on a flat surface and just combed it. Lots of hair I didn't even see came out and the rug's nap came up nicely too! I didn't pull out any rug fiber either!
I never thought to do before, but will definitely do again!
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I found out by accident the best way to clean my old throw rugs. I washed them and hung them on the clothesline outside. Then it rained, and rained and rained. To my surprise, they were cleaner then when I first hung them out.