Some FB groups below. You may need to request approval to join.
Detailed Review
https://www.facebook.com/groups/832254780270317/
Dallas Paint Correction:
https://www.facebook.com/groups/2282632198672640/
Autogeek:
https://www.facebook.com/groups/799213330213940/
A FB page for DetailersDomain.com (they're a retailer that occasionally have really good sales, especially around the holidays):
https://www.facebook.com/detailersdomain/
Youtube channels:
Dallas Paint Correction
https://www.youtube.com/channel/UCVl...QbHMmKdVWTleaQ
Apex Detail
https://www.youtube.com/channel/UCqZ...htUBnebhY_ro_Q
Rag Company
https://www.youtube.com/channel/UCQ2...n1WT-I-hDUG2YA
Ammo NYC
https://www.youtube.com/user/AMMONYCdotcom
Note the two different Dallas Paint Correction things. His Youtube channel has a ton of great "how tos" and product reviews. He recently started selling his own products. I haven't bought/used any yet, but they look good. His videos aren't quite the same as they were and he can be a little difficult to watch, but the info is really good.