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In our experience, you need water quality below 30 PPM to clean PV and solar systems with pure water. Whether the water comes from a mixed bed resin system or an RO system is not decisive for the cleaning result, as long as the amount of water is sufficient and you do everything technically correctly.
Some useful, mobile osmosis systems including accessories for the production of pure water for PV and solar cleaning can be found here:
Complete sets for professional PV and solar cleaning
Whether the value that your water reaches is 0, 15 or 30 PPM is generally not particularly relevant for solar cleaning.
Osmosis systems deliver stable values that are rarely 0 PPM, but rather 2-8 PPM.
Mixed bed resins deliver 0 PPM for a long time after the resin change until the conductivity increases.
This usually happens rapidly from a value of approx. 3 PPM, which is why the water value must be checked frequently.
