resisting Prestidigitation

[0-hr]

On player character used Prestidigitation to soil another's armor (while they were wearing it). I would likely have allowed a save (the armor being an attended object) but I can't figure out what "see text" is refering to in the spell description. With this uber cantrip also cutting through spell resistance like it wasn't there, how can one defend against such harassment?

Prestidigitation
Universal
Level: Brd 0, Sor/Wiz 0
Components: V, S
Casting Time: 1 standard action
Range: 10 ft.
Target, Effect, or Area: See text
Duration: 1 hour
Saving Throw: See text
Spell Resistance: No

Prestidigitations are minor tricks that novice spellcasters use for practice. Once cast, a prestidigitation spell enables you to perform simple magical effects for 1 hour. The effects are minor and have severe limitations. A prestidigitation can slowly lift 1 pound of material. It can color, clean, or soil items in a 1-foot cube each round. It can chill, warm, or flavor 1 pound of nonliving material. It cannot deal damage or affect the concentration of spellcasters. Prestidigitation can create small objects, but they look crude and artificial. The materials created by a prestidigitation spell are extremely fragile, and they cannot be used as tools, weapons, or spell components. Finally, a prestidigitation lacks the power to duplicate any other spell effects. Any actual change to an object (beyond just moving, cleaning, or soiling it) persists only 1 hour.

 

[Darklone]

Well... worn items use the saves of the wearer or it's own if it's higher... in that case, I'd use a Reflex save (to dodge the soil). A Will save might be ok too.