Most critters do not like loud low frequency noisy. Makes them think they are going to be stepped on by bigger critters. Speakers and some good rap tunes might do the trick.It sounds awful but no smell.

1954 Chevy Half-Ton
In the Stovebolt Gallery
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1958 Chevy 1/2-Ton Stepside
In the Stovebolt Gallery
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"Time's fun when you're having flies." ~~ OLD FROG