jordan MTR C2 exit 寶靈街, immediately onyourleft is 庇利金街, keep going straight along 寶靈街, the next street on your right you'll come across 白加士街, you should be able to find 澳洲牛奶公司 easily. actually it's very near to MTR station.
OR, if you're walking from yue wah, cross the jordan road at entrance of yue wah, then walk along jordan road. turn left into 白加士街.
BY THE WAY, i went to SHAM SHUI PO 維記 for 牛通, i think it's much better than 澳洲牛奶公司 .