If you really think you are having issues with "dirty" propane they do make propane filters for travel trailer systems like refrigerators and air conditioners.
It has been my experience that as long as I let the tank sit still for an hour after hooking it up what ever "dirt" there might be will stay put at the bottom of the tank until it gets refilled and even then another hour will allow it all to settle out.
Most often getting dirt in the molten glass is the result of having too much fuel to the available oxygen using a hot head or a mixed gas torch or (more often) working too close to the torch and this doesn't let the fuel get burned before it contacts the glass.
ETA: Just make sure that your hose is "T rated" to work with propane. If you use a hose made for acetylene the propane will cause the hose to disintegrate and you will get a gummy ooze as well as flecks of crap gumming up your torch and showing up on your glass.
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