Most household cleaners that contain soap are alkaline the mildest being washing up liquid and another is sugar soap, it just depends on th PH your are looking for which I doubt you would know.
We use alkaline cleaners based on their strength for a whole number of jobs and make a huge chunk of our income on them. Sugar soap (although we dont use it) is the most accessable and can be mixed in varying strenghts.
I cant comment if this would be good enough, I am just answering the alkaline question, not sure if this has helped.
