To get the results you would want to get fir your customer it is best to know the type of leather so that the best product and method can be selected to get the best results.
Leather Maintain (the trade version of Lazy Leather) is an all in one non detergent cleaner that can be used safely on all types of leather except Suede and Nubuck
It is great for in between deep cleans but would not be suitable for really dirty leather
Products sold in the shops are so far from professional products you may as well just use water for all the good they will be!!
Dilutable products would be detergents which are not suitable for Aniline style leathers as they will simply soak in and not do any cleaning at all.
We offer a 1 day Leather ID and cleaning course if that is of interest
Please feel free to give me a ring to chat through anything regarding products - we are always happy to help
Cheers
Judyb