what type of cleaning product, powder, gel, tablets etc -plain or combo is recommended to get the best cleaning and drying results from my beko 6837 dushwasher. If a combo tablet or gel is the best do I still need to add rinsing agent/ or salt seperately.
the water hardness level is medium

maris, March 2010

Wikipedia article says this...

Some newer dishwashers allow the use of "all in one" tablets (which include an amount of salt along with detergent and a rinse agent) instead of using separate salt and rinse aid, but dishwasher salt must still be added to the salt compartment in very hard water areas.

However, best results are achieved by using separate salt, rinse aid and detergent rather than using the combined "all in one" detergents with these included.

Incorrect use of "all in one" tablets/detergents may not be covered under the dishwasher's warranty; it is advisable to check the instruction book when using these types of tablets/detergents.

Peccavi, March 2010

Salt - Good quality rinse aid - good quality powder detergent - avoid the multi-tabs.

Purely personal opinion.

A cleaning tablet a couple of times a year may help - not sure though.

Wilipedia has an article on dishwashers.

Peccavi, March 2010