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I used products from Furniture clinic
https://www.furnitureclinic.co.uk/?gclid=Cj0KCQjw-4SLBhCVARIsACrhWLXgAMxds8264V3ptPGs28XAsx9cpJokJUsQ5Tc0bdVD7V4pWajs-4waAjTVEALw_wcBThey also do a steering wheel kit which I used on my 318i steering wheel with good results, I would use proper leather cleaning products, any oils will affect the ability for colouring.
https://www.furnitureclinic.co.uk/catalogsearch/result/?q=+steering+wheel+kitBefore
After
Not to come across as rude, but you should mention who supplied the kit you used again ;)
I've used the woolies kits (https://www.woolies-trim.co.uk/category/117/leather-renovation) on older leather, and used fine wire wool to clean the leather. Used a paint pad to paint the leather. It is very labour intensive.