To explain the bad smells', and coverage of sin, it is, when you have done something that is not correct by your own subconscious admissions', and you have even the slightest amounts of faith, you will immediately follow it up with a good counteraction...thus, this is also rewarded and an expiation of sins', by Allah, as a set decree of revelations', thus' to state, it is also stated, that you should try your best, to the best of your ability, once you know and or are in full knowledge of attainments' of religous education, not to do that action wrong and or bad action again.