Explanation: While medieval hygiene was far from great by modern standards, especially amongst the non-elite, it was about normal for pre-modern societies. People took baths - if not always in tubs, then at least in the local rivers and streams. The 'medieval people didn't bathe' myth is actually more accurate to the Renaissance period, when a mixture of urban culture in bath-houses making them suspected as places of 'sin', and a strange variation of miasma ('bad smell') theory caused ~150-200 years of anti-bathing sentiment. Bathing never entirely went away, but became less popular.
Miasma theory was normally used to encourage cleanliness, but in the Renaissance, a prominent variation of the theory was used to discourage bathing - as bathing would open up the pores of the skin, and let the 'bad air' in to the body. As long as the 'miasma' was on the outside, it was safe!