anyone can tell me how to remove the periodic noise from the image? what filter should i use?

here is my code for adding periodic noise into colour image

A=imread('Lena.bmp');
B8=double(A);
s=size(A);
[x,y]=meshgrid(1:s(1),1:s(2));
p=round(50*sin(x./3+y./5)+1);

B8(:,:,1)=B8(:,:,1)+p;
B8(:,:,2)=B8(:,:,2)+p;
B8(:,:,3)=B8(:,:,3)+p;
for i=1:s(1),
  for j=1:s(2),
      for k=1:s(3),
          if  B8(i,j,k) < 0;
              B8(i,j,k) = 0;
          end
          if  B8(i,j,k) > 255;
              B8(i,j,k) = 255;
          end
      end
  end
end
B=uint8(B8);
figure,imshow(B);