Hi guys, First time poster here! How you all doing?. Im a dog walker looking to employ someone part time. The person came out yesterday and loved it but went home last night struggling with allergies from the dogs, she's pinpointed it to the van as the dogs are in close proximity. Does anyone have any advice what I could do to limit the chances of her allergies starting off but keeping the dogs in the van? I've thought about air purifiers but unsure what would help?