Sanitizing has more to do with cleaning things. Also, the strict use of the word means that all germ/ microbes on the sanitized object would be removed. For example tattoo artists sanitize their needles in an autoclave or you might sanitize a table by whiping it with bleach. Hygiene is the more general word for keeping oneself clean, or how someone else keeps themself clean. For example, you might say someone has good hygiene if they shower,use deodorant, brush their teeth and hair, and shave on a regular basis. Someone with bad hygiene is usually smelly and somewhat gross looking.