Table 5.

Key themes and illustrative quotes

Themes	Facilitators	Barriers
Usability	“it is handy and easy to carry in a trouser pocket or a backpack”	“there’s too much inside, you don’t use all the liquid. Sometimes, it flows out on the side”
	“the opening system is ingenious making the product easy to use and easy to open”	“it would be good to make it less liquid”
Usefulness	“you don’t need water, you don’t need a sink, wherever you are you can use it”	“unlike the product, with the wipes, you can clean your hands when they’re dirty”
Safety and skin reaction	“the product is good, it dries fast, it’s not greasy; I like the smell and that it leaves the hands soft”	“I know someone who used it for heating the drug”
Psychological and cognitive factors	“after the use, I had the feeling that the hands were really clean”	“I do it more as if I’m washing my hands, without necessarily insisting on fingertips”
	“if you have it nearby, it’s easier to remember to use it”	“the wipes are better to wash when my hands are dirty”
		“it is hard to change habits”
Socio-environmental influences	“I was proud to have it so I show it to other people”	“if you’re on a coke session, every 10 min you’ve your head in the bag, you’re not going to be washing your hands every 10 min”