There are a couple of schools of thought on Smartstrand, or PPT.
Its oil loving characteristics make it hold onto surfactants as well oily soils. If you aren't getting it in a grossly soiled state (good luck on that...), non surfactant cleaners like Cleanfree and Procyon products are good choices. The idea is that you won't be leaving another oily residue (surfactant) to cling to the fiber.
(No, an acid rinse won't do much to break that bond)
The other way is to just drop your high pH nuclear bomb prespray of choice on it, and use mechanical preconditioning tools or rotary jet extractors to help break up the oil bonds. Some find that olefin fiber preconditioning products work well here too.
Don't have "nylon cleaning expectations" with this product though.