Vacuuming my great kilt.

[Sir Didymous]

how about in the dryer, no heat, air only? - should remove most of the grass, seems to work for dog hair, etc.

I tried that with my wife's bedding that she brought, but I still ended up shaking it afterward.

[tundramanq]

Tumbling in the dryer tends to build up a static charge in synthetics and to a lesser extent hair/wool. This will work better if there is a slightly damp cotton towel in there with the kilt. The humidity allows the charge to dissipate and the hair will stick to the towel if the filter doesn't get it.
I would still be leery of tumbling a kilt that hasn't been built for this type of use/abuse. I run even Utilikilts on delicate/hand cycle in my front loader washer and then hang dry. The tumbling action is pretty aggressive in the large drum driers - they only have one tumble speed with the intent to toss the clothes air born in the drum. I envision a great stress on the ends of the sew downs, thread and fabric, with a half yard of free pleating below flying every which way as the next drum paddle flies by.

[Sir Didymous]

Tumbling in the dryer tends to build up a static charge in synthetics and to a lesser extent hair/wool. This will work better if there is a slightly damp cotton towel in there with the kilt. The humidity allows the charge to dissipate and the hair will stick to the towel if the filter doesn't get it.
I would still be leery of tumbling a kilt that hasn't been built for this type of use/abuse. I run even Utilikilts on delicate/hand cycle in my front loader washer and then hang dry. The tumbling action is pretty aggressive in the large drum driers - they only have one tumble speed with the intent to toss the clothes air born in the drum. I envision a great stress on the ends of the sew downs, thread and fabric, with a half yard of free pleating below flying every which way as the next drum paddle flies by.

With my great kilt that's not such an issue. There is nothing sewn on it. But I can see the concern for sewn kilts. I hang mine too.

[tundramanq]

Oops sorry, I kind of forgot the "great" part reading through the string. So what we are dealing with is a very long wool blanket. The closest thing I have dealt with is wool bed blankets and dog hair. I hang it outside on the clothes line and beat it with a tennis racket once it is dry from the Woolite bathtub wash. The grass ( and amazing amounts of dirt and dander ) should come off a lot easier than hair.
Tumbling this long of a piece in the drier will need un-wading every couple minutes.