How often should i bath my Alaskan Malamute?

I have tried to research this, but get mixed answers. Some sites say to bath very rarely, only really when he is shedding as it can ruin his skin and woolly undercoat, but some sites say to bath fairly often. He isn't really a smelly dog, and when he gets muddy he gets hosed off in the garden, which he loves, but he HATES being bathed indoors. When he was a pup he got bathed quite a lot as he would roll in everything gross he found, but am not sure how often he should be getting bathed now?