Since it is '06 stuff your BB is a sealed cartridge unit. That being so it is not servicable other than by replacement. Also be sure you do not blast it with a hose when cleaning. Any rinsing you do with a hose must be only hard enough that you would use it on a fragile garden plant. Otherwise you risk blowing water in past the seal contact points. If that happens bad things will soon follow.... which may be what is happening if you cleaned the bike with a hard spray at some points in the past. As for taking the BB apart for cleaning there is nothing inside to clean and there is no easy way to inject any grease into the bearings which are hidden behind the seals. If your sealed BB cartridge has gotten stiff for any reason then it's a case of simple replacement.

At the back end if your freehub is sticky and rough you can try flushing it with WD 40, work it a little and then turn it cassete side down to drain out. The trouble is that by sending WD40 into the freehub you will also flush the wheel bearings so this flushing and re-oiling is best done during a wheel bearing removal and cleaning. But if you catch the freehub early enough in it's downhill slide to ruin you can save it and get many more years of use from it. If the flushing doesn't work and it's still gritty and stiff then at least the axle is already out and you can remove the freehub easily for replacement.

Unlike FB I've had more than my share of gummed up derraileur jockey pulleys. Winter commuting around here ensures that they will rust tight or gum up on a regular basis. The good news is that it takes very little to clean and polish them and lightly grease and put back together.

Last is the chain. You'll need to flush it well to get rid of any sand that got embedded from a beach ride.