i'd advise to replace the belts , i always recommend dealer/oem or gates belts (google: majestic honda should be the first listing).
there are no muffler bearings lmao
i knew a girl that fell for diesel engine jake brake pads.
to clean any metal component without sensors or rubber, braklean, degreaser, stong solvent will work fine. like if you pull the pulley off to clean. i would use sensor safe cleaners if you keep it on the engine because (on our 4 cyl. engines) the tdc/ckp sensors are at the very bottom of the timing area.
dealers don't use that gunk crap from the assembly line, you probably shouldn't either if you plan on keeping your vehicle oem/stock