To many suds in the water is a no no, regardless of whether you use washing up liquid or a specialist liquid.
To much water isn't good either, you just have more to mop up & detail.
If you have a huge pane of glass such as on some shop fronts, then yes, you want you applicator laden with water, but as a general rule, less is more.
hot, dry weather you adjust to accordingly, it really depends on your skill and experience levels.
Try to put just enough of whatever detergent you use to give you enough 'glide' to work with.
Specialist liquids are designed NOT to suds up! So never let the lack of suds bother you.
The more detergent you have in your water, the greater the film left on the glass when you've finished...bad news!!
Ian