Cleaning tick marks: What's the most effective method?

Of course you should clean yours when your done. You do clean them, don't you?? Don't you?? Hah I'll admit I've forgotten to more than once, but I'm trying to be better bout it. I've always just brushed mine off, but that tends to still leave a dispersed white mark. Anyone have a better method? Bonus points for something that doesn't require lots of shenanigans and extra gear. And no, kids, we're not going to just "let the rain take care of it", this be steep terrain... 

travel size spray bottle 50/50 iso alcohol and water. a rag or brush to wipe away as needed.

A squirt of plain water also works pretty well. Obviously try to be totally sure that you're the last party of the day before you go about wetting holds (and YMMV with local weather, expected drying time, and ethics of climbing on wet rock)

Don't make a tick mark.  Done.

Brush.

I always just pee on the ticks until you can’t make them out anymore.  Works like a charm

I've found isopropyl pretty effective at turning egregious ticks and chalk graffiti into white smudges. 

This is an improvement, but the chalk still remains.Not sure there is a cure for this.

What's the rationale for diluting the isopropyl? 

Isn't 70% iso already 30% water? Seems like diluting it further will just make it evaporate more slowly.

White powder problems...

Will J wrote:

I always just pee on the ticks until you can’t make them out anymore.  Works like a charm

Will has the right idea.

Will J wrote:

I always just pee on the ticks until you can’t make them out anymore.  Works like a charm

A true climbing steward walks around the boulders on rest days, pissing on every bit of chalk.

Don't bother. If anyone confronts you just tell them it's Fulgarite.