HELP now is getting from worst to worst! not some light scratch/stain on the cmos camera sensor! i spot dust and try blower but can't blow off and decide to use cotton bud and when i use the canon EOS manual cleaning and mirror flip up , i use the cotton bud and check if theres any hard mini sharp articles and before i clean its free of sharp items and after i notice i try to clean the sensor it become like sratch/stain! which i donno is scratc or stain! and this camera is only 2weeks old 400D what should i do? send to cleaning at canon? will it affect any of my pictures? i use F9 onwards i can see the dust and F20+ i can see the scratch!