Mine are nice and clean, and never have seen them like that. Historically I use "Spray Power" by Crown to deep clean, and it works great. Unfortunately I cannot find it locally anymore. I have been using "Simple Green" this summer and it seems to work as well. Spray Power was very nice, just spray it on full strength and car wash brush the whole TT clean. It takes all the black streaks, bugs, everything right off. My HTT still looks brand new. I hope Simple Green works as well in the long run.
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