Difficulties In Maintaining Wudu
Yes, as a principle even sweat does not invalidate wuzu. However, it needs to be kept in mind that in cases where it cannot be clearly established whether a wudu nullifier has happened or not, it is recommended to redo the wudu. For example, sleep itself is not a wudu nullifier but since one cannot establish whether a wudu nullifier has happened or not during sleep, therefore it is asked to redo wudu as a precautionary measure. The same applies to other situations, if a distinction can clearly be made between a wudu nullifier and a non-nullifier, then there is no need to redo wudu in case of a non-nullifier. But cases where this difference cannot be established clearly, then redoing wudu would be required as a precautionary measure simialr to how it was with sleep. Please refer to the following response to clearly see the wudu nullifiers : Discussion 36957 • Reply 37010