Advice needed please! We have 2 girl guinea pigs around 2 or 3 (unsure as rehomed) & they have got hay mites! This is the second time they’ve had them, when we got them in February they came with the mites. We bathed them & put treatment on and thought that would be it but now we’ve noticed again when brushing them! Planning on getting treatment again but is there anything we can do to prevent this? Should we use a prevention treatment? We clean them out weekly & use sawdust + hay in their cage. Any advice would be great! Thanks - Kerry.