If you take the action out of the stock, reassembly has a few items to watch out for. The trigger has a U-shape which must engage a crosspin as you are settling the action back in, AND you also have to engage the magazine cutoff bar into the action at the same time. It's not hard, you just have to be aware of those two things to line up correctly.
Brake cleaner is good but expensive, and not needed when you can take all the parts out like you can with the 151. Ed's Red or any other solvent would do fine here. And with all semi-auto .22s and their filthy ammunition, lube with BreakFree CLP.
Great rifles.