Solar panels are subjected to the weather throughout the year. Dust, pollen, bird droppings, insects, leaves, and all other kinds of debris may accumulate on the glass. This makes it more difficult for sunlight to get to the panels. Although rain is able to clear away some of this stuff, it doesn’t always manage to remove all of it.
That’s the role that R-MC S21 plays with solar panel cleaning. When a solar panel system requires more than simple water cleaning, Peak Solar Pro uses R-MC S21, a cleaning product that is designed for solar panels. This helps to loosen tenacious dirt and residue so that our cleaning equipment can remove it from the glass.
Why We Use a Solar-Specific Cleaner
Solar panels are different from normal windows since they have special glass and coatings which need to be treated properly. For this reason, we use a cleaner that is made for photovoltaic panels, not one intended for household glass.
The R-MC S21 is designed to handle many of the contaminants solar panels encounter outdoors, This includes such elements as pollen, bird droppings, dust, organic residue, and coastal deposits. This is especially useful in New England, where solar panels face everything from spring pollen to summer dust and coastal salt. This makes R-MC S21 one of the best solar panel cleaning solutions.
S21 Is Part of Our Cleaning Process
We never use R-MC S21 just in order to give the panels a cleaner appearance. Our aim is to get rid of the material that has built up on the panel surface so that the system can perform as well as possible.
The cleaner is only one element of the process. What else is involved? Our technicians select the right mix of water, brushes, equipment, and cleaning methods depending on the condition of each solar installation. For larger systems, R-MC S21 can also be used with our robotic cleaning equipment.
Not Every Solar Panel Needs the Same Cleaning
A residential system that has a little dust may require a different method than a commercial one caked with dust; the same applies to solar farms, agricultural installations, and coastal sites.
That is why we examine the panels before deciding how to clean them. If there is tenacious residue, R-MC S21 gives our technicians an effective way to clean the panels properly.
Why Peak Solar Pro Uses R-MC S21
Frankly, R-MC S21 Solar Wash Fluid works so well for us. It is designed specifically for solar panels and helps loosen dust, pollen, bird droppings, and other common contaminants. This reduces the scrubbing needed to clean the glass.
When it comes to cleaning, R-MC S21 leaves a clean, streak-free surface and is suitable for home systems, commercial installations, and solar farms. R-MC S21 is non-corrosive and biodegradable, and its concentrated composition requires only a small amount of product per cleaning.
Fraunhofer CSP, a leading solar research organization, tested the R-MC S21 for material compatibility, and it is also Green Seal Certified. The Green Seal certification provides independent confirmation that the product meets relevant environmental standards. This gives our customers another reason to feel confident about the products we use on their solar panels.
For us, the main benefit is simple: it lets our technicians clean solar panels more efficiently. Peak Solar Pro, R-MC S21 is another tool that enables us to perform thorough, professional cleaning while protecting the panels, our technicians, and the environment.

Frequently Asked Questions
What is R-MC S21?
R-MC S21 is a specialist cleaning product designed for photovoltaic solar panels that helps loosen dirt and other tenacious residue from the panel surface.
Is the R-MC S21 a cleaner for household glass?
No, it was developed for cleaning solar panels, which is why Peak Solar Pro includes it in its expert cleaning process.
Does Peak Solar Pro use the R-MC S21 for each solar panel cleaning job?
No, we don’t select our cleaning method based on the condition of the panels and the type of buildup present.
Can the R-MC S21 be used in conjunction with a robotic solar panel cleaning system?
Yes, the R-MC S21 can be used to clean solar panels, whether traditional or robotic.
