1. Power cleaners are snake oil.
2. Personally I use and love this Kester solder and this chipquik flux

I've been using Chipquik for years now mainly because I don't like how Amtech flux smells and how it's very sticky! I could be wrong.

https://www.amazon.com/ChipQuik-SMD-291-Clean-Syringe-Nozzle/dp/B00CM2A97S/ref=sr_1_2?dchild=1&keywords=chipquik&qid=1598645557&sr=8-2