The manufacturer is specific about the ratios and it is best to follow what it says.
From 1:10 to 1:80 for heavy dirt.
1:80 for light dirt.
So, for 1:10 we have 10ml for 100ml of water (for heavy dirt)
10ml for 1:50 we have 500ml of water.
For light cleaning (minimal dirt) 10ml for 1:80 we have 800ml of water.

Personally, I added 150ml of product to 500ml of water! I used it to clean the interior of a truck (atego) that mainly had dust! I sprayed it generously and scrubbed with a brush that fits in a drill. Then I wiped directly with a damp microfiber cloth. It cleaned very well, but not the very "deep" dirt. I recommend it! It's worth it!

Very good product for cleaning with a perfect fresh scent! I have been using it for a year for the entire interior of the car and it still hasn't finished with diluting 50ml of cleaner and 450ml of water

Excellent!! It cleans everything very easily and makes them look like new, I can't find a reason to buy something more expensive!

Very good product.
I used it on car upholstery with plastic and leather.
It works great and with a brush it removed grease and dirt from the surfaces without much scrubbing with a soft brush.
It is a highly recommended product for personal use.
For professionals, it will definitely do a good job, but they might find something in a larger package that is more economical.
As a semi-professional Detailer, I recommend it.

ATTENTION! The product comes in a 500ML spray bottle and you ONLY need to use 10ML of the cleaner, the rest of the water is highly CONCENTRATED product!
So you can understand that a 1L bottle of the product is essentially 100 spray bottles of 500ML or simply 50 liters of spray.

For personal use, you only need to buy it once in your lifetime.