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Well as for your MAF sensor, I'd say don't worry about it. I don't know exactly where it's located on a Corolla, but on my Ford truck you can see it by looking down the intake between the air cleaner and the throttle body itself. I've cleaned mine a couple times...........
(you'll hear different folks tell you use ONLY non-residue brake cleaner, electrical contact cleaner, do use windex, don't use windex, etc. etc.)
.........FWIW, I use non-residue (it'll say it on the can) brake cleaner. When you look in your intake, you'll see a couple wires that look like tiny guitar strings. Spray 'em. Wait a minute or two and then spray 'em again. (Go ahead & really get 'em good). I prefer to not use a Qtip or any of that crap 'cuz breaking one of 'em means a good chunk of money (min $100).
Anyway, although I've cleaned mine a couple times, I don't know that it honestly does much. I was recently told by a mechanic that because the wires are temp sensitive sensors, they pretty much burn off anything that could prevent them from doing their job. IOW, you might help if you live in rural USA and have a lot of dust/dirt, but might be just as well leaving it alone.
My .02!
(My opnion on spark plugs is good old-fashioned OEM plugs. Pull out whatever was in there.....NGK, Bosch, etc. and put the same kind right back in.)
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