How are you managing soft wash chemical blending in the field?

​I am looking to hear how other exterior cleaning business owners are handling their soft wash chemical mixing on job sites. Are you running direct metering manifold systems to mix on demand, or are you still relying on batch mixing in holding tanks before heading out?

​If you switched from batch mixing to a proportioner system, has the time saved and control over chemical usage justified the equipment cost? Also, if you built your own manifold setup rather than buying pre-built, what valves and check valves held up best against high-strength bleach?

​Curious to hear what setups are holding up best for you guys in the field.