They will often have subcontractors, etc that they need to pay, so I wouldn't be too hard-nosed about things... they need some money to function (perhaps)... but certainly the last 25% of the pay should come when the job is finished and you are happy.  

Let it burn....A non functioning and bickering government is the best government.

I used the invoicing function in Wix and showed the deposit required as paid.  

I understand the calendaring functions of the booking sites.  

Geeze, can we get an edit function please?

The challenge of making them beautiful AND functional appeals to me for probably the same reasons I'm in the career field I am.

By using a regular flapper design, but with a 3" valve rather than the traditional 2", and by actually designing it for low flow rather than adapting it like early low flow's, it functions perfectly.

@George W. is not the first plumber I've heard endorse Gerber for long-term functionality and Toto for something a step up.

Roof Maxx rejuvenates asphalt shingles back to functioning like new shingles. 

This is a place where local people recommend local people - there are probably already lots of good recommendations on there, so check it out.My advice is to have TWO cleaners in rotation at all times.