By Tom Victor Andre Onana’s use of Vaseline on his gloves in Manchester United’s draw with Liverpool left some fans confused, but he was using a method other goalkeepers have employed in the past. Cameroon international Onana was called into action on plenty of occasions as United dented Liverpool’s title hopes. The visitors recorded 28 shots at Old Trafford, but needed a late penalty from Mohamed Salah just to claim a point. Eagle-eyed viewers queried Onana’s use of Vaseline on his gloves. However, other keepers have indicated the substance can help with grip in wet weather. Both teams had to…