How do you stop your glasses / Goggles fogging up?

dan shard
dan shard Posts: 722
edited December 2011 in MTB general
Im sure there have been posts in this before but I couldnt find any so apologies, but wondered how you do it? Ive had loads of different types of glassess and goggles of varying expense and always get this problem. Been trying to look into this week and heard lots of different opinions, from washing-up liquid to spit, to muc-off antifog. Whats the best and what do you use??

TIA

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