This is the 8802nd most frequent German word.
kärcher
"Kärcher" is a brand name for high-pressure cleaning equipment and appliances manufactured by the German company Alfred Kärcher GmbH. It is often used colloquially to refer to pressure washers.
Here, 'kärchern' is used as a verb indicating the action of cleaning with a Kärcher, demonstrating linguistic flexibility.
Man kann viele Oberflächen effektiv kärchern.
One can effectively clean many surfaces with Kärcher.
Here, 'Kärcher' is used as a noun referring to the brand of a pressure washer.
Ich werde die Terrasse mit dem Kärcher reinigen.
I will clean the terrace with the Kärcher.
In this sentence, 'gekärchert' is a verb derived from the brand name to describe the act of cleaning using a Kärcher pressure washer.