If someone follows its dilutions, it might be more economical than Green Star. For interiors, it's from 0.5% to 1%. That is, in 1000ml, it's from 5ml to 10ml.
For paintwork, it's from 1% to 5%, meaning from 10ml to 50ml in 1000ml of water.
For wheels, it's 10%, i.e., 100ml in 1000ml of water.
For prewash, again it's 1 - 5%. You can use it even stronger, but it's not necessary.
That's what I like about Bilt Hamber. It allows for high dilutions without losing any effectiveness.

Excellent product. Depending on the dilution you make, you can use it everywhere. It is not suitable for leather, according to the manufacturer. I used it for the engine of my car with a 1:10 dilution and with minimal brushing, the engine shone. The car is 6 years old and the engine had never been cleaned. It's a must-buy, really.

The best and most powerful APC on the market, plain and simple. If you try this one, you won't need to go back to the other more well-known popular brands on the market. This specific product dilutes according to the job you have to do. For tough tasks like cleaning engine bays, wheel wells, etc., you put 100ml of product in 1 liter of water (yes, that little is all you need) and it does an amazing job. The only downside is that you still can't buy a 5-liter bottle of Surfex HD here in Greece like they sell in England