For the longest time I never bothered to wash my goalie gloves, but over time the smell emanating from my kit became too much. I have seen recommendations to hand wash the gloves carefully with shampoo so be sure the gloves are not damaged. Which works okay I guess if you have the time. You can carefully lather the inside and out with soap and rinse well hanging to dry always.
I however am more lazy than that, I usually just throw them in the wash with similar colors, and haven’t had a problem yet. Always hang to dry, I also don’t wash them often since they likely would fall apart faster. I must say that having started to wash my goalie gloves has extended the life somewhat since for whatever reason in the past I would replace a lot sooner. At the time I thought they were just worn out but maybe it was because they were too funky…