Yes, I understand that the 2% rule is a quick and dirty acid test, not a proforma, but I'm curious how ya'll use it practically in different scenarios.

I use 50% water and 50% muriatic acid, pour it directly on the top of the stove, on top of the inside of the oven door and inside the oven and I can make the worse-looking stove in the world look like it just came out of the box in less than 20 minutes.As for the rest of every unit we clean we always clean inside the toilet bowl with muriatic acid and we make the worse-looking toilet look brand new within a few minutes.

Its been kicking my *** without AC. Id

But now that agent has to put it back up for sale and waste days on market which is essentially ACID to the price of the home. 

Another remedy that I read about was using commercial grade vinegar 15% , it is acidic and will kill the bamboo , but it cost $ 600 per 55 gallons .

With no exception, the pet occupied units get much dirtier filters (which I personally change once every 30 days), and the coils needing acid washing much more frequently.  

We mix diesel fuel and boric acid together and the cockroaches never came back.Joe Gore

And the bondo patch on it is still holding...If you use a sulfuric acid based rust stopper don't use a foam sponge to apply it- use a rag.

Steven Maduro, you can get rid of roaches permanently with "Roach Prufe", which is boric acid.

One other item to (politely) hit your neighbor over the head with is the fact that a tree's roots will continue to grow for months AFTER it is cut down.Suggest to your neighbor to have a sewer service use a cutter blade and clear out his line, and then use an acid wash on a regular basis to keep the roots from overgrowing his sewer.