I cannot condone ANYONE using reheated milk for ANYTHING yuck! yucky yuck yuck yuckity YUCK! Baristas make hundreds of coffees a day and should, at a certain point, be able to know exactly how much milk they need to make certain drinks in certain cups and mugs etc. also, if there is a production line of coffees think about it logically, it's like a puzzle, what two coffees can you make together? are there two macs coming up but not together? make enough milk for them both and you will not have to waste time or extra milk by steaming twice. having said that, you cannot do that for all beverages and it will be more efficient if you use a smaller jug to steam for each beverage ie. lattes, caps etc. and better for quality control. i agree with other postings, you see too many 'baristas' reusing old milk. it will affect the taste, the texture, the smell, everything. just don't do it, please this is one time when recycling is NOT good. :o(