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Just about to pop out the shops to get something to clean up my rear XTR disc, which got a bit marked up by some contaminated pads.
Should i get:
a) Wire wool.
b) Fine grade wet/dry
Cheers 
Hey buddy, personally i think i'd go for 'b'. However i've never tried it so if someone who's tried it responds i'd listen to them. One thing i do know though is that when i used minearal spirits (like meths) to clean my dics it ruined the pads so I would use a designated cleaner.
Cleaning-removing oil or such like that has contaminated your disc I use common or garden Auto brake cleaner.
Removing scoring marks caused by "contamintaed" pads with embedded grit particles, You need a brake disc lathe.
Wet and dry will only make the problem worse when the SiC particles get onto your pads.
Wire wool tends to be oily so an absolute no-no
I just use those little alcohol wipes that they use before an injection.
Thinners here. Free from work.