The worst thing you can do when playing against a maniac is go into crazy 3b/4b wars with him, because that's his comfort zone so just play solid.As you see he can pretty much massacre you if he starts running good, but it works both ways.
Tighten up your ranges, limp call bottom of your opening range.Pot control more in big pots, slowplay more, take small stabs/ stay away from big bluffs.

I think the topic of proper adjustment to exploit your opponent is very important and not approached with the same rigor as other situations. So I think this could turn into an interesting thread.

Our goal is to maximize our EV by exploiting our opponents imbalances. Let's assume that our opponent has a static strategy and won't make any adjustments regardless of how we play.

I like SPrince idea of limp calling some hands OR you'll need to probably open raise less unless Villain is making really big errors in the rest of his game.

I disagree with SPrince that you should 4-bet less. In fact, I think the proper adjustment would be to 4-bet for value wider since the Villain is 3-betting too much and rarely folding. Along the same lines, I would never 4-bet bluff.

Our 3-bet flatting range might need to be a little tighter since the Villain has a very high flop and turn c-bet frequency, so we won't be able to call wide preflop... unless the Villain gives up a TON on the river in which case we could probably flat against 3-bets about normal. Along the same lines, when we flat a 3-bet and the Villain c-bets then we'll probably have to fold the bottom of what is our usual calling range unless he gives up a TON on the river. A more subtle adjustment might be that we call with all made hands and top unmade hands that can call down, but we fold hands which require the Villain to give up on future streets like overcards with bdfd.

In single raise pots where our opponent DIDN'T 3-bet, I would likely be very aggressive. Since our opponent is 3-betting us soo much and hardly folding to 4-bets, I assume that he's 3-betting a very depolarized range which means that his preflop calling range when he doesn't 3-bet is going to be very weak. Either we're going to be able to get ALOT of folds postflop OR we're going to be able to value bet very thinly.

I think this is a spot where the 1-A concept is very useful for adjusting. If you can work out how much you need to defend to make his bluffs breakeven you have a good starting point and then against this villain who is doubtlessly far too heavy on bluffs you can simply defend wider than 1-A. Now all his bluffs lose him money and all his valuebets make him extra money, but he's heavily weighted to bluffs so he will be losing a ton of money overall.

Great answers guys. Very detailed and interesting @Santaur!
Keep coming with ideas and suggestions if you got any guys!