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once a week...
I just want to check I'm doing all I can to keep them going for as long as possible.Imo once a week with oils sounds a lot and risks clogging the pours. I'd have thought a clean with a brush followed by a wipe with a slightly damp microfiber once a week is more reasonable.
Then every other week maybe a shoe cream after a slightly more thorough clean.
Normally I'd say you should clean shoes/boots with saddle soap once or twice a year, followed by a good moisturising routine. Given these take a beating maybe every 4 months - as an eg my casual motorbike boots are prob washed 3-4x a year, depending how much winter / salt riding I do.
One sure way to extend their life is to wear another pair / alternate each day and use shoe trees in the evening.
I've got a pair of William lennons that are my work boots. I clean them and apply boot oil (pine and mink I think) once a week. However, due to the crap that ends up on them throughout the working day (boric acid, paint, 2k thinners, cutting fluid, tears etc) they seem to have dulled quite a lot. This doesn't bother me, I just want to check I'm doing all I can to keep them going for as long as possible.