I am new to camping and thought this was a really good question. I wouldn't know whether the chemicals would smell worse than the wee. Would it be better to put some dettol in the bottom as well as the duck!
It would be a good idea to have FAQ page for us newbies.
When I used the bucket and lid ,I put a few drop of zoflora is the bottom ,wouldnt use the loo chemicals for fear of splash back ,the chemicals you put in the loo are formaldehyde (sp ?)
Id say 'really nice smelling 'is p[ushing it a bit ,I reckon it reaks!! But its in a really small bottle and is very highly concentrated so great for camping!