With Keeper gloves (If they have a latex component) you can wet them by placing a small amount of water on them or you can spit saliva on them. This softens the latex slightly giving them a stickier surface.
Some Goalies have in the past used spray glue (Upholstery glue) on the palms before a big game, but keep in mind the solvent in the glue usually degrades the glove much quicker.
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do not wash then with soup and cold water if they are new, wash them with gloves washer or hot water only
Try making an 'l' shape with your leg,which ever direction you are going in, as this will put your body behind the ball and stop it from going in