I clean my juicer after each and every juice I make... the pulp hardens on the screen mesh and the other attachments making it real work to clean later. And a dirty juicer can be a health hazard.

It is highly recommended that you drink the juices as soon as they have been made. Freezing them for later is probably the least hazardous to the juices, then say, popping them in the fridge for later consumption. But, even freezing damages some of the nutrients and enzymes. But it's better than not drinking juices at all and it's better than storing it in the fridge. But the best is to make the juice and drink it down then and there.

Just my two mangoes worth...

Good luck!
~ Dazzle

Depending on how good the juicer is, the juice can be stored. Greenstar and Solostar are the best at juicing leafy greens and both are 2 of the top juicers out there and because they don't really heat up the juice, they extract the most nutrients.

I make a batch of juice every morning and then refrigerate a few glasses in like Ball or Mason canning jars to drink later. Freezing isn't really a good idea, it'll just expand in the glass and can break. You can't have air in the glass..that'll kill the juice too.

And cleaning it immedietly after use is the best way. Even waiting a half hour can be a pain to clean because the pulp hardens. Even if you just give it a quick rinse, then let soak int he sink untill you're ready to actually wash it.