Food-grade (white) plastic buckets - with snap-on lids (a small one to milk into, mine takes about 5 ltrs, squat enough to go under a GG plus a larger one to collect milk from several goats). Small plastic jug if you find that milking one teat at a time is easier, especially at the beginning. Cone-shaped stainless steel filter with filter paper (the largest ones you can get from Goat Nutrition, bought in large packs once a year to save on delivery charges - they don't go off, I use only once). Large 2ltr plastic jugs with lids from Ikea for storing in fridge, if freezing using milk bottles from OH's work kitchen/coffee place. That's all I use at home, stainless steel for showing, but almost al bought second-hand, as new ones of good quality are very expensive.
All of mine washed straighter after filtering milk, very hot water and normal washing-up liquid. Every so often (usually when I need to wash the machine clusters), buckets get soaked in Milton. Stainless steel sive goes into dishwasher regularly.