I just got myself a scuttle, and am looking at using it but one question eludes me.

Do you store the soap in the top of the scuttle or do you simply build the lather in the top part with the drain holes ?

Do you put soap in the top and leave it in there until its all gone and build a lather on top of it ? Or load the brush with soap and then build a lather in the top bowl ?
And are the drain holes just to get rid of excess water ?

I could not find a video on youtube of someone actually USING a scuttle. Only found ones of bowls in sinks.

I have not yet used any other method yet, just waiting on soap and lather I have ordered to start trying this out.