Seems overkill. I use pure dish detergent under the tap directly with my fingers (you can feel the dirt, do not press against the lens). Dry with a new/clean paper towel by pressing (buffering? do not drag the paper across the lens). Dirt cheap, perfect result in seconds, can be done everywhere. Normal hand soap contains moisturizer, so this is not indicated (but generally works too although might leave stains).
If your lens is being scratched by this try spending a bit more on better glass. There's no point in skimping on something you hold on your eyes the entire day. Mine always lasted more than 7 years, and I only ever needed to change due to loss of acuity.
> If your lens is being scratched by this try spending a bit more on better glass. There's no point in skimping on something you hold on your eyes the entire day.
Doesn't always work that way. I never skimp on glasses, atm I'm looking through 500+€ Zeiss lenses (that's just for lenses, frame price not included), I've had them for a year and have one visible scratch. I always take care of my specs, always carefult when cleaning or putting on table but still have one pretty big and annoying scratch. How did it get there, I have no idea.
A single solid scratch might be caused by an accident of sorts, this can always happen.
The kind of damage the OP is speaking about seem to match the description of very light superficial scratches causing diffused softening. Could be damaged coating, or just the glass being too soft.
I've only seen this happen on cheap (and normally polymer) lenses.
If your lens is being scratched by this try spending a bit more on better glass. There's no point in skimping on something you hold on your eyes the entire day. Mine always lasted more than 7 years, and I only ever needed to change due to loss of acuity.