@Alan9337
Your issue appears to be the same as mine, where artifacts are left in the technical views. Pascal has logged this as a bug (see here).
For the moment, I’m am just living with it until I come to print my layout. If it is not displayed correctly, save the file with the layout page open and then close the file. Reopen the file and the problem should be gone for the moment, allowing you to print correctly. Works about 80% of the time. Hopefully this will get fixed in the near future!
Yup, I’m in shipbuilding
I haven’t figured this out fully but have been thinking about it a lot. The pairs of clipping planes has its issues as you have identified, and cutting sections also has its issues (e.g.how to show objects on the near side vs far side of a bulkhead, how to make sure lapped brackets show up etc.)
I think that the solution for ships lies somewhere in a hybrid solution, e.g.show the hull by cutting sections (e.g. with section tools), and show the internal structure as modelled in 3D using the technical display. To do this, cut your hull section, and put the section on a new layer. In a detail view, turn off the hull layer and apply clipping planes to show the section and structure in question.
As for managing clipping planes, I keep my clipping planes on a layer (or groups of layers) to only show the ones I need at any time. The clipping planes will still work, even if the layer they are on is turned off. Also make sure that the clipping planes are only applied to the detail view they are affecting. I find that if you duplicate a detail view, any clipping planes linked to the original detail view will now also be linked to the new detail view.
(a) I get a lovely PDF of my layout 
(b) I get a lvoely dwg/dxf of my layout, minus all the content from the detail views. Oh, and all my dimensions are fubar’d. 
If I save the whole file as a dwg, then everything is there, except all the views of the model are in wireframe, and the dimensions are still fubar’d. And by fubar’d I mean that they measure in paper space, not model space, and they are HUGE compared to all the other text on the page. It could be useable if you wanted to spend the time cleaning it up, but at that point i’d be as well doing the whole thing in AutoCAD. Oh, and it still doesn’t solve the whole 3D vs 2D thing (where we want to work in 3D but present only 2D to the client).
(c) They’re not really comparable. (a) is presentable to a client. (b) is not.