"best" hot tub cleaner?

Rejuvenating a hottub. It's funky and possibly quite germ-y.
What's best? Bleach? "shock" tablets? Exorcist?
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I'm pursuing cleaning a spa tub that keeps spitting out black and white greasy- soapy chunks (I call 'em old-people chunks, based on the folks I bought the house from), and a local spa shop recc'ed some 'super concentrated chlorine', a teaspoon in 110 gallons supposedly kicks grime's butt. It is sold primarily as a sanitizer. I joked (1/2 anyway) about dumping half the thing in my tub and they said the fumes would probably kill me.
This stuff (its granular) carries a warning about getting it damp- it'll catch fire if it gets moist. That's how you can tell its the good stuff, I guess.
Haven't tried it yet, or I'd give you an evaluation.
Dave
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JohnH wrote:

Teenage boys with the promise of the keys for the car this weekend.
--
Joseph Meehan

Dia duit
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