my routine isn't "a valid processing routine", it is my way of killing the "attachees" on the leaves then cleaning them. I have the sense, like most I would assume, to collect leaf litter from woods away from pesticides/traffic/dog walkers etc.
I would not even contemplate going through any processing suggestions that have been given with leaves from a city as that would be irresponsible.
I have leaf munchers in my viv, so my methods account for this.