If you find a few specs of dust on your telescope lens , they are best cleaned off with a blower brush or bulb blower. Do not try to wipe them off.
As a rule of thumb, any small particles on your telescope objective will not affect the performance., and can be left.
If you use a lens cleaning fluid, always use a high quality product as recommended by the manufacturer or dealer. Remember to use a dust blower before applying a cloth or fluid.
A very important point when using lens cleaning fluid (bottle or spray) is to apply to your cleaning cloth first. Never apply the fluid direct on to the lens.
Another option to lens cleaning cloths or fluids is a dry cleaning tool such as the Celestron lenspen.