I’ve had really good results with this stuff. It’s kind of expensive but it’s RMA no clean and the viscosity is great. The syringe is really convenient and allows you to use a precise amount so it ends up lasting a while.

I also have the RA version of this paste and use it for practice and for older components that might need extra cleaning power. I clean up the flux residue no matter what, but if the no clean version performs similarly you can’t go wrong. You just need to use a toothpick or brush to apply it. Extremely cheap though.

If you are unsure, it couldn’t hurt to get one of each - that’s actually how I ended up with them and I don’t regret it one bit.