The gun itself is a very fun little gun to shoot. I used it on rabbits and fox up here with great results. I would warn you to be very cautious when disassembling/assembling it for cleaning. (Yes, these things like to be 'clean', at least mine did.) The hardware (screws, nuts, etc) are really soft. You need to be extra careful to avoid over-tightening or you'll either strip the head or break the screw. I replaced all my hardware with stainless stuff.
As far as cleaning the bolt, when you have the gun fully disassembled (read the instructions in the manual, they'll run you through it step-by-step) pull the bolt out, unscrew the recoil spring guide rods (this will help you move the bolt without having to hold it in place), and give the whole thing two or three good washings with carburetor cleaner. Then attack it with a nylon brush. Then wash it with the carb cleaner again. Repeat until clean. The powder residue will build up in between the bolt and the housing and you'll be able to feel the grit in there when you first pull the bolt back. It'll feel like you're dragging the bolt against sandpaper.
As far as the entire receiver body goes, remove the optics rail from the top of the receiver (if so equipped), remove the rear sight post, the magazine release, forearm, and mock suppressor and you'll be able to seperate the two sides of the receiver from each other for a good carb cleaner washing and nylon brushing. There are a few small parts on the inside, so be careful to remember what they are and where they go. This also allows you to remove the barrel and scrub around the outside of the feed ramp and chamber (it gets really dirty right there). Putting it back together is a real pain in the rear, but be patient and be careful, it'll all go back.
I actually sold all of my .22lr rifles and pistols, I was tired of sub-par .22 ammo getting worse and worse. But I remember most everything about disassembly and reassembly, so if you have any questions, give me a shout.
They are fun, but the maintenance can be a pain the first few times you do a full, all-out cleaning. (I did it about every other trip to the range, about 1k rounds, or once a month in my monthly Preventative Maintenance System)
Good luck.