More than likely just as you say dirt, but actually in the castleated ring on the outter CV joint, it's this the sensor reads off. They become full of grime and rust and so the signal drops off when you get close to a halt. Give 'em a blow out with a can of brake and clutch cleaning spray. Also, worth checking it isn't caused by a split CV boot. If the boot splits it can fill the ring with grease.
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