What is the best way to clean a really resin filled downstem?

First, do not let it get that dirty.  Clean more often.

But if this has happened, letting soak in a super soaker overnight is a good way to let the resin fall off.

You can also rinse under hot water.  The hot water will make the resin softer, and the pressure will push the resin out.  It is good to not let the water get too hot or you could burn yourself.  Only go as hot as you can handle.

Using a pipe cleaner will also make your cleaning job easier.

How do mask detoxes work? How long does the “mask” last?

This would not be a good detox.  A detox is supposed to clean out your system.  What some call a mask is the detox does remove all the toxin from saying the simple parts of your body.  This lasts for a day or so.  The toxins in your fat cells and other deeper shall we say cells will release into your more simple parts and you will be toxic.  Hope this makes sense.

As you do the flush or detox more, you will have less and less, eventually being toxic-free.  Just do not put toxins back in.

Can taking to big or a dab cause you to throw up, if so why?

For some yes.  This we do not fully know, but we think that when your body is flooded with toxins, it has to purge them.  Take a smaller hit, enjoy life.

Cannabis is not in small amounts, but anything in your lungs besides fresh air is not good.

Why are perc repairs so difficult to come across?

A waterpipe is put together in sections.  Perc are very hard to repair because once the glass is closed, it is really too hard to get inside.  If you get inside the tube is ruined, so you need a new tube.  Too much to break, too much to mess up.