For trad i tend to use customers own hot water, hot works better than cold and I use fairy also. But I carry two bottles, one watered down for application to the wet applicator, saves messing about applying small amounts of neat and then lathering up in bucket, Straight in bucket with applicator and a squirt down the length with the ready made solution then straight ont'tat glass, squeegeed off with pulex soft used at 14" followed by a steaming mug of tea.