How do you remove old pet stains from part wool fitted carpets?

Try using baking soda-—remove as much as you can with a towel. Once the bulk of it has been removed, sprinkle the area liberally with baking soda. Allow this to sit for 30 minutes, then vacuum.

I'd suggest contacting a professional rug company and ask their opinion on proper cleaning. They will know best.

Go to bathroom cleaning supplies and look fot clorax brand urine remover in yellow and black bottle and you might try that works really good on set in blood that was dried on high heat works on colored sheets and kids clothes also.

Try 1001 Carpet Cleaner from Grocery Store Cleaning section.