How-to clear the screen in cygwin on windows

Do not bother with the default cmd.exe terminal started by default when you start bash ...
Use puttycfg

1. download the puttycfg , unzip to C:\temp\something
2. Find out where cygwin1.dll is installed cygcheck -sd >list.txt
3. Open the list.txt ( it is quite big ) : notepad list.txt 
4. Copy all the files from   C:\temp\something  to the dir where the cygwin1.dll is located 
5. Start the putty.exe 
6. In the GUI , check that Session on the Left is selected , click on Cygterm option , for hostName type - , leave port number 22
7. Click on open 
8. Run the clear command ... Now you have much better terminal ...