Karcher states in manual that you can use any other brands detergents. I found this one to be best value for money: https://amzn.to/45yeQEt
If you need the same detergent, just smaller jar this one might be for you: https://amzn.to/4ewdj5H
However, if you prefer to stick with the Karcher brand, here is you might consider: https://amzn.to/4eCVvG0
I'm filming on Samsung galaxy S24 Ultra: https://amzn.to/45yEQ2k
Held by ram mount: https://amzn.to/2MbpAEB
or
GoPro Hero 10 I got from here: https://amzn.to/3NMj55h
Don't have money for genuine GoPro gear, me too. I got my accessory kit here: https://amzn.to/3t9xbE5
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